builtin-name-rev.c

   1 #include "builtin.h"
   2 #include "cache.h"
   3 #include "commit.h"
   4 #include "tag.h"
   5 #include "refs.h"
   6
   7 static const char name_rev_usage[] =
   8         "git-name-rev [--tags] ( --all | --stdin | committish [committish...] )\n";
   9
  10 typedef struct rev_name {
  11         const char *tip_name;
  12         int merge_traversals;
  13         int generation;
  14 } rev_name;
  15
  16 static long cutoff = LONG_MAX;
  17
  18 static void name_rev(struct commit *commit,
  19                 const char *tip_name, int merge_traversals, int generation,
  20                 int deref)
  21 {
  22         struct rev_name *name = (struct rev_name *)commit->util;
  23         struct commit_list *parents;
  24         int parent_number = 1;
  25
  26         if (!commit->object.parsed)
  27                 parse_commit(commit);
  28
  29         if (commit->date < cutoff)
  30                 return;
  31
  32         if (deref) {
  33                 char *new_name = xmalloc(strlen(tip_name)+3);
  34                 strcpy(new_name, tip_name);
  35                 strcat(new_name, "^0");
  36                 tip_name = new_name;
  37
  38                 if (generation)
  39                         die("generation: %d, but deref?", generation);
  40         }
  41
  42         if (name == NULL) {
  43                 name = xmalloc(sizeof(rev_name));
  44                 commit->util = name;
  45                 goto copy_data;
  46         } else if (name->merge_traversals > merge_traversals ||
  47                         (name->merge_traversals == merge_traversals &&
  48                          name->generation > generation)) {
  49 copy_data:
  50                 name->tip_name = tip_name;
  51                 name->merge_traversals = merge_traversals;
  52                 name->generation = generation;
  53         } else
  54                 return;
  55
  56         for (parents = commit->parents;
  57                         parents;
  58                         parents = parents->next, parent_number++) {
  59                 if (parent_number > 1) {
  60                         char *new_name = xmalloc(strlen(tip_name)+8);
  61
  62                         if (generation > 0)
  63                                 sprintf(new_name, "%s~%d^%d", tip_name,
  64                                                 generation, parent_number);
  65                         else
  66                                 sprintf(new_name, "%s^%d", tip_name, parent_number);
  67
  68                         name_rev(parents->item, new_name,
  69                                 merge_traversals + 1 , 0, 0);
  70                 } else {
  71                         name_rev(parents->item, tip_name, merge_traversals,
  72                                 generation + 1, 0);
  73                 }
  74         }
  75 }
  76
  77 static int name_ref(const char *path, const unsigned char *sha1, int flags, void *cb_data)
  78 {
  79         struct object *o = parse_object(sha1);
  80         int tags_only = *(int*)cb_data;
  81         int deref = 0;
  82
  83         if (tags_only && strncmp(path, "refs/tags/", 10))
  84                 return 0;
  85
  86         while (o && o->type == OBJ_TAG) {
  87                 struct tag *t = (struct tag *) o;
  88                 if (!t->tagged)
  89                         break; /* broken repository */
  90                 o = parse_object(t->tagged->sha1);
  91                 deref = 1;
  92         }
  93         if (o && o->type == OBJ_COMMIT) {
  94                 struct commit *commit = (struct commit *)o;
  95
  96                 if (!strncmp(path, "refs/heads/", 11))
  97                         path = path + 11;
  98                 else if (!strncmp(path, "refs/", 5))
  99                         path = path + 5;
 100
 101                 name_rev(commit, xstrdup(path), 0, 0, deref);
 102         }
 103         return 0;
 104 }
 105
 106 /* returns a static buffer */
 107 static const char* get_rev_name(struct object *o)
 108 {
 109         static char buffer[1024];
 110         struct rev_name *n;
 111         struct commit *c;
 112
 113         if (o->type != OBJ_COMMIT)
 114                 return "undefined";
 115         c = (struct commit *) o;
 116         n = c->util;
 117         if (!n)
 118                 return "undefined";
 119
 120         if (!n->generation)
 121                 return n->tip_name;
 122
 123         snprintf(buffer, sizeof(buffer), "%s~%d", n->tip_name, n->generation);
 124
 125         return buffer;
 126 }
 127
 128 int cmd_name_rev(int argc, const char **argv, const char *prefix)
 129 {
 130         struct object_array revs = { 0, 0, NULL };
 131         int as_is = 0, all = 0, transform_stdin = 0;
 132         int tags_only = 0;
 133
 134         git_config(git_default_config);
 135
 136         if (argc < 2)
 137                 usage(name_rev_usage);
 138
 139         for (--argc, ++argv; argc; --argc, ++argv) {
 140                 unsigned char sha1[20];
 141                 struct object *o;
 142                 struct commit *commit;
 143
 144                 if (!as_is && (*argv)[0] == '-') {
 145                         if (!strcmp(*argv, "--")) {
 146                                 as_is = 1;
 147                                 continue;
 148                         } else if (!strcmp(*argv, "--tags")) {
 149                                 tags_only = 1;
 150                                 continue;
 151                         } else if (!strcmp(*argv, "--all")) {
 152                                 if (argc > 1)
 153                                         die("Specify either a list, or --all, not both!");
 154                                 all = 1;
 155                                 cutoff = 0;
 156                                 continue;
 157                         } else if (!strcmp(*argv, "--stdin")) {
 158                                 if (argc > 1)
 159                                         die("Specify either a list, or --stdin, not both!");
 160                                 transform_stdin = 1;
 161                                 cutoff = 0;
 162                                 continue;
 163                         }
 164                         usage(name_rev_usage);
 165                 }
 166
 167                 if (get_sha1(*argv, sha1)) {
 168                         fprintf(stderr, "Could not get sha1 for %s. Skipping.\n",
 169                                         *argv);
 170                         continue;
 171                 }
 172
 173                 o = deref_tag(parse_object(sha1), *argv, 0);
 174                 if (!o || o->type != OBJ_COMMIT) {
 175                         fprintf(stderr, "Could not get commit for %s. Skipping.\n",
 176                                         *argv);
 177                         continue;
 178                 }
 179
 180                 commit = (struct commit *)o;
 181
 182                 if (cutoff > commit->date)
 183                         cutoff = commit->date;
 184
 185                 add_object_array((struct object *)commit, *argv, &revs);
 186         }
 187
 188         for_each_ref(name_ref, &tags_only);
 189
 190         if (transform_stdin) {
 191                 char buffer[2048];
 192                 char *p, *p_start;
 193
 194                 while (!feof(stdin)) {
 195                         int forty = 0;
 196                         p = fgets(buffer, sizeof(buffer), stdin);
 197                         if (!p)
 198                                 break;
 199
 200                         for (p_start = p; *p; p++) {
 201 #define ishex(x) (isdigit((x)) || ((x) >= 'a' && (x) <= 'f'))
 202                                 if (!ishex(*p))
 203                                         forty = 0;
 204                                 else if (++forty == 40 &&
 205                                                 !ishex(*(p+1))) {
 206                                         unsigned char sha1[40];
 207                                         const char *name = "undefined";
 208                                         char c = *(p+1);
 209
 210                                         forty = 0;
 211
 212                                         *(p+1) = 0;
 213                                         if (!get_sha1(p - 39, sha1)) {
 214                                                 struct object *o =
 215                                                         lookup_object(sha1);
 216                                                 if (o)
 217                                                         name = get_rev_name(o);
 218                                         }
 219                                         *(p+1) = c;
 220
 221                                         if (!strcmp(name, "undefined"))
 222                                                 continue;
 223
 224                                         fwrite(p_start, p - p_start + 1, 1,
 225                                                stdout);
 226                                         printf(" (%s)", name);
 227                                         p_start = p + 1;
 228                                 }
 229                         }
 230
 231                         /* flush */
 232                         if (p_start != p)
 233                                 fwrite(p_start, p - p_start, 1, stdout);
 234                 }
 235         } else if (all) {
 236                 int i, max;
 237
 238                 max = get_max_object_index();
 239                 for (i = 0; i < max; i++) {
 240                         struct object * obj = get_indexed_object(i);
 241                         if (!obj)
 242                                 continue;
 243                         printf("%s %s\n", sha1_to_hex(obj->sha1), get_rev_name(obj));
 244                 }
 245         } else {
 246                 int i;
 247                 for (i = 0; i < revs.nr; i++)
 248                         printf("%s %s\n",
 249                                 revs.objects[i].name,
 250                                 get_rev_name(revs.objects[i].item));
 251         }
 252
 253         return 0;
 254 }
 255